Chrome Concentrate Grades: 40-42% and 46-48% Cr₂O₃
What the Cr₂O₃ percentage on a chrome offer means for ferrochrome producers, and why South African and Zimbabwean concentrates occupy different niches.
Every chrome concentrate offer leads with one number: the Cr₂O₃ percentage. It is the single largest driver of price, but grade alone tells only part of the story. Buyers weighing a 40–42% South African concentrate against a 46%+ Zimbabwean product are really comparing two different value propositions, and the right choice depends on the furnace it is destined for.
What the grade number means
Chrome concentrate is priced per unit of contained chromium oxide, so a higher grade means more payable metal per tonne shipped. Freight, port handling and logistics are charged on gross tonnes, which is why high-grade material carries a premium beyond its simple metal content: every percentage point of Cr₂O₃ is a point of freight you are not paying on waste rock.
Alongside grade, smelters scrutinise the chrome-to-iron ratio (Cr:Fe). A higher ratio yields a higher-grade ferrochrome alloy, which is why Zimbabwean lumpy and concentrate from the Great Dyke, with naturally elevated Cr:Fe, commands attention despite the region's logistical challenges.
The South African standard: 40–42%
Concentrates from the Bushveld Igneous Complex, including material from Steelpoort in the east and Rustenburg in the west, typically assay 40–42% Cr₂O₃ with a Cr:Fe ratio around 1.5:1. This is the workhorse grade of the global stainless value chain, and Chinese ferrochrome producers have optimised entire furnace fleets around it. It is abundant, consistently specified, and moves in volume through Richards Bay, Durban and Maputo.
The Zimbabwean premium: 46% and 48%+
The Great Dyke produces some of the highest-grade chromite on earth. Concentrates at 46% and 48%+ Cr₂O₃ with Cr:Fe ratios approaching 2.8:1 allow smelters to produce high-carbon ferrochrome with superior chrome content, lower slag volumes and lower power consumption per tonne of alloy, a meaningful saving where electricity is the dominant cost.
Which grade suits which furnace
Volume stainless producers running large AC furnaces generally favour the SA 40–42% standard for cost and availability. Producers targeting premium alloy specifications, or blending to lift an average feed grade, look to Zimbabwean 46–48%+ material. Many sophisticated buyers run both: a base load of Bushveld concentrate with Great Dyke tonnes layered in as furnace economics dictate.
What this means if you are selling
If you run a wash plant or hold a stockpile, the grade on your certificate decides which buyers you should be talking to. Bushveld 40 to 42% material sells into volume smelters that buy every week and value consistency above all, so a plant that can hold its grade from one load to the next is worth more to them than one that occasionally touches 44%. Great Dyke 46 to 48% material sells on its chrome to iron ratio, so a seller who can evidence a high ratio on an independent certificate should present it that way rather than quoting against the 42% market.
Two habits move the price you achieve more than anything else. First, put the full specification on the table at the start: Cr₂O₃, the chrome to iron ratio, silica, moisture and sizing, with the laboratory named. Second, agree how out of specification results are settled before the first truck moves. A written premium for material above the base grade, and a written penalty below it, turns an argument into arithmetic. We explain how those schedules are usually built in how chrome concentrate is actually priced.
If you produce or hold chrome concentrate at either grade and want to know whether there is a buyer for it at today's prices, tell us what you have.
Chrome Concentrate
We place chrome concentrate with named international buyers. Tell us the grade, roughly how much you hold and where it sits, and you will know inside a trading day whether we have a buyer.
